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Phase relations in the system (chromium + rhodium + oxygen) at T = 1273 K have been determined by examination of equilibrated samples by optical and scanning electron microscopy, powder X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). Only one ternary oxide, CrRhO3 with rhombohedral structure (, a = 0.5031, and c = 1.3767 nm) has been identified. Alloys and the intermetallics along the (chromium + rhodium) binary were in equilibrium with Cr2O3. The thermodynamic properties of the CrRhO3 have been determined in the temperature range (900 to 1300) K by using a solid-state electrochemical cell incorporating calcia-stabilized zirconia as the electrolyte. For the reaction,where Cr2O3 has the corundum structure and Rh2O3 has the orthorhombic structure. Thermodynamic properties of CrRhO3 at T = 298.15 K have been evaluated. The compound decomposes on heating to a mixture of Cr2O3-rich sesquioxide solid solution, Rh, and O2. The calculated decomposition temperatures are T = 1567 ± 5 K in pure O2 and T = 1470 ± 5 K in air at a total pressure p° = 0.1 MPa. The temperature-composition phase diagrams for the system (chromium + rhodium + oxygen) at different partial pressures of oxygen and an oxygen potential diagram at T = 1273 K are calculated from the thermodynamic information. 相似文献
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《Polyhedron》2007,26(9-11):2200-2206
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Ana Filipa L.O.M. Santos André R. Monteiro Jorge M. Gonçalves William E. Acree Maria D.M.C. Ribeiro da Silva 《The Journal of chemical thermodynamics》2011,43(7):1044-1049
In this paper, the first, second and mean (N?O) bond dissociation enthalpies (BDEs) were derived from the standard (p° = 0.1 MPa) molar enthalpies of formation, in the gaseous phase, , at T = 298.15 K, of 2,2′-dipyridil N-oxide and 2,2′-dipyridil N,N′-dioxide. These values were calculated from experimental thermodynamic parameters, namely from the standard (p° = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, , at T = 298.15 K, obtained from the standard molar enthalpies of combustion, , measured by static bomb combustion calorimetry, and from the standard molar enthalpies of sublimation, at T = 298.15 K, determined from Knudsen mass-loss effusion method. 相似文献
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Manuel A.V. Ribeiro da Silva Ana I.M.C. Lobo Ferreira Ana Rita G. Moreno 《The Journal of chemical thermodynamics》2009,41(1):109-114
The standard (p° = 0.1 MPa) molar enthalpies of formation of 2-, 3-, and 4-chloronitrobenzene isomers, in the crystalline state, at T = 298.15 K, were derived from the standard (p° = 0.1 MPa) massic energies of combustion, in oxygen, at T = 298.15 K, measured by rotating bomb combustion calorimetry. The standard molar enthalpies of sublimation of the isomers, at T = 298.15 K, were obtained by high temperature Calvet microcalorimetry.
Empty Cell | /(kJ · mol?1) | /(kJ · mol?1) | /(kJ · mol?1) |
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2-Chloronitrobenzene | 2939.5 ± 0.7 | 18.7 ± 1.0 | 80.9 ± 1.5 |
3-Chloronitrobenzene | 2915.8 ± 0.8 | 42.4 ± 1.2 | 82.5 ± 1.5 |
4-Chloronitrobenzene | 2921.7 ± 1.4 | 36.5 ± 1.6 | 76.2 ± 2.1 |